Bob Bolton, there is/was a Mudcatter with that name (DADGBE), who's an outstanding guitarist. I wonder if it's the same person.

And thanks, folks, for all these great ideas for me to try out on my new Martin. More ways to avoid doing work! I discovered drop D via the first two Gordon Lightfoot songbooks when I first taught myself guitar as a med student in 1974, but only use it sporadically. Sounds like something worth exploring (even though I can't sing in Don McLean's range for very long without breaking something).

Aloha,
Mark